| Nylon fabric has good softness and high wearing comfort.Because of its wear resistance and high elasticity,it is often used in the production of textile products such as sports shirts and socks.These products are in direct contact with human skin.Under the combined action of sweat stains,dander,and body temperature,bacteria are extremely easy to breed on the surface of the fabric.Antibacterial nylon fabric can effectively improve this problem and protect human health.As one of the most studied inorganic antibacterial agents,Ag antibacterial agents are widely used in the antibacterial modification of fibers and fabrics.High-priced silver sterilizes quickly,has high effectiveness,and has excellent antibacterial effects.However,there is not much research on the application of high-priced silver as an antibacterial agent on antibacterial textiles.In this paper,AgO is used as an antimicrobial agent.Ultrasound,low temperature plasma,polydopamine(PDA)and other methods are used to assist AgO deposition on nylon fabrics to prepare AgO deposited nylon fabrics,and test their antibacterial properties.The specific research contents are as follows:(1)Study the preparation conditions of high purity AgO.Using silver nitrate AgNO3 as the precursor,K2S2O8 as the oxidant,and potassium hydroxide KOH as the precipitant,AgO powder was prepared by oxidative chemical precipitation.The prepared sample powder was characterized by field emission scanning electron microscope,X-ray diffractometer and chemical titration.The results show that the optimal preparation conditions for the preparation of high-purity AgO by oxidation chemical precipitation method are:c(AgNO3)=0.05mol/L,n(K2S2O8)/n(AgNO3)=2:1,reaction time is 30 minutes,reaction temperature is 60?.The AgO content of the prepared powder can reach 93.2%.(2)Research on the auxiliary method of AgO deposition nylon fabric.Disperse the prepared AgO powder particles by ultrasonic vibration and deposit them on the nylon fabric;through the low temperature plasma treatment,the nylon fiber surface is etched to increase the surface roughness of the fiber,so that AgO is deposited on the fabric surface;PDA modified nylon fabric Through the adhesion of PDA,AgO particles are deposited on the fiber surface.The experimental samples were characterized,and the excellent auxiliary methods were judged by AgO deposition rate,SEM images and XRD diffraction patterns.The experimental results show that the auxiliary effect of ultrasonic oscillation method is not obvious,and the deposition rate of AgO is only 0.448%;the auxiliary effect of low temperature plasma technology is obvious,AgO can be effectively deposited on the surface of nylon fabric,the deposition rate is up to 1.567%,which can be It can be seen that there is a large amount of AgO deposition,but the particle agglomeration is serious;the auxiliary method of PDA modified nylon fabric has the best auxiliary effect,which can make the deposition rate of AgO reach 3.398%.In the SEM image,it can be seen that the AgO particles are uniform It is dispersed and deposited on the surface of the nylon fabric,which improves the serious situation of AgO agglomeration.The crystal structure of the AgO deposited nylon fabric can also be observed by XRD diffraction pattern.(3)Explore the optimal technological conditions of DA solution modified nylon fabric.DA solution self-polymerizes to produce PDA to modify the surface of the nylon fabric,so that the surface of the nylon fabric is covered with a PDA layer to obtain a PD@PA fabric.Combining the weight gain rate of PDA and the weight gain rate of AgO,it is found that the weight gain rate of PDA is basically positively correlated with the weight gain rate of AgO.Therefore,it can be considered that the deposition effect of AgO is related to the excellent layer modification layer of PDA.In order to obtain a well-modified PDA@PA fabric,the optimal conditions for DA solution self-polymerization were explored by changing the conditions of the DA solution,reaction time,reaction system temperature and other conditions.The test results show that the best conditions for DA solution self-polymerization are:when the modified solution pH=8.5 and the water bath temperature is 40?,c(DA)=3 g/L,c(H2O2)=0.6 mL/L,c(CuSO4·5H2O)=1.8 g/L;the time for treating the fabric with the modified solution was 2 hours.Under the condition of PDA@PA fabric prepared under this condition,it can be seen that the surface of the fabric fiber is covered with a uniform and dense PDA coating.(4)Test the antibacterial properties of AgO deposited nylon fabric.For the preparation of AgO deposited nylon fabrics prepared by different auxiliary methods,the antibacterial property of Staphylococcus aureus and Escherichia coli was tested by the oscillation method.The experimental results prove that AgO has excellent antibacterial properties.Even with an AgO deposition rate of 0.448%,the nylon fabric still shows about 80%antibacterial properties.Low temperature plasma assisted AgO deposition of nylon fabric,AgO deposition rate is 1.271%,antibacterial test found that the antibacterial rate can reach more than 90%.The antibacterial rate of AgO/PDA@PA fabric against Staphylococcus aureus can reach 99.15%,and the antibacterial rate against E.coli can reach 99.89%.Due to the high-efficiency antibacterial properties of AgO,even after AgO/PDA@PA fabrics have undergone 20 water washing experiments,the antibacterial rate can remain above 98%. |
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